[s-cars] FPRs & squirts

[Kirby Smith]

Is the spray pattern the same for an ADU at 3 bar vs. an AAN at 5 bar?
Looks like the ADU would provide the best headroom, but maybe idle
control would be difficult.

kirby

Frank Amoroso wrote:
>
> Hey all,
>
> I am playing with Bosch injectors and looking for ~ 10% more flow for some
> additional duty cycle headroom and what-not. I want to stick with Bosch
> injectors for a couple different reasons. I also want to stick with stock
> replacement type FPRs for reasons of durability and cleanliness of install.
> I have come up with two different ways to get an ~10% flow increase (both of
> which involve running a given injector, from the list below, at 1.0 Bar
> higher pressure than it ran stock).
>
> So, check out the following quasi-matrix (hopefully it makes it through
> email with some semblance of formatting). I list different fuel pressures in
> Bar, and then three injectors with their respective cc/min flow rates at
> those same Bar pressures, respectively.
>
> Fuel Pressures in Bar, of 3.00 (3B), 3.80 (ADU / RS2), 4.00 (AAN) and 5.00
> (aftermarket) respectively
>
> AAN injector flows (323 stock):                 280, 315, 323, 361
> 3B injector flows (310 stock):          310, 348, 358, 400
> ADU / RS2 injector flows (415 stock):   360, 405, 415, 465
>
> So, AAN injectors run 323 cc/min at the AAN stock 4.0 Bar FP. Hence, AAN
> injectors will run 361 cc/min at a 5.0 Bar FP.
> Also, 3B injectors run 310 cc/min at the 3B stock 3.0 Bar FP. Hence, 3B
> injectors will run 358 cc/min at a 4.0 Bar FP/
>
> So, the question becomes do I buy 5 new 3B injectors (for ~$450) to replace
> my 100k+ mile units, install them in my car @ 4.0 Bar to net 358 cc/min
> each, or do I simply add a 5.0 Bar FPR to my car (for free as I already have
> the part) to net 361 cc/min??
>
> Or, do I simply get my existing units balanced and blueprinted and then run
> them at 5.0 Bar?
>
> Thoughts???
>
> Frank--
>
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